A union for tubes having a first external wall and a second internal wall coaxial with the first to define a chamber around a central duct. The union includes at least two seats for reception each of one end of a tube to be connected. Each seat includes a first surface designed to adhere to an end segment of the first wall of a tube inserted in the seat and a second surface coaxial with the first and designed to adhere to an end segment of the second wall of the tube. Between the first and second surfaces of the union there is a connection surface. The union includes in it first ducts which lead into the connection surfaces to provide connection between the chambers of tubes inserted in the seats and second ducts which lead into spaces circumscribed by the second surfaces to provide connection between the central ducts of the tubes.
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11. Die for production of double-wall tube unions with air space comprising plugs for production of the seats for reception of the tube ends to be jointed and broaches for production of ducts for connection of the air space of the tubes when the die is in position for pressing the broaches intersecting the plugs and entering them through the mouth of said seats.
13. union for tubes having a first external wall and a second internal wall coaxial with the first to define a chamber around a central duct with the union comprising two seats arranged coaxially and in opposite directions for reception each of one end of a tube to be connected and each seat comprising a first surface designed to adhere to-an end segment of the first wall of a tube inserted in the seat and a second surface coaxial with the first and designed to adhere to an end segment of the second wall of said tube with there being between the first and second surfaces of each seat of the union a connection surface with the union comprising in it at least one first duct which leads onto said connection surfaces to provide connection between the chambers of tubes inserted in the seats and at least one second duct which leads into spaces circumscribed by the second surfaces to provide connection between the central ducts of said tubes.
1. union for double-wall tubes having a first external wall and a second internal wall coaxial with the first external wall to define a chamber around a central duct, the union being a single piece construction and comprising:
at least two seats for reception each of one end of a double-wall tube to be connected, each seat comprising a first surface designed to adhere to an exterior surface of an end segment of the first external wall of a double-wall tube inserted in the seat, and a second surface coaxial with the first surface and designed to adhere to an exterior surface of an end segment of the second internal wall of said double-wall tube, at least one first duct to provide connection between the chambers of the double-wall tubes inserted in the seats, at least one second duct which opens into spaces circumscribed by the second surface of each seat to provide connection between the central ducts of said double-wall tubes, a connection surface in each seat connecting the first surface to the second surface of each seat, said at least one first duct opening onto said connection surfaces, and the first and second surfaces of each seat being arranged sequentially in the seat for receiving a double-wall tube with the end of the second internal wall extending beyond the end of the first external wall.
2. union in accordance with
3. union in accordance with
4. union in accordance with
6. union in accordance with
7. union in accordance with
8. union in accordance with
9. union in accordance with
12. Die in accordance with
14. union in accordance with
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The present invention relates to unions for tubes of the double wall type i.e. tubes in which the internal duct is surrounded by a chamber or jacket coaxial therewith. The present invention also relates to dies for making said unions.
For example such tubes are used for conveyance of polluting liquids while holding the external jacket under pressure and passing the liquid through the central duct. If the tube is punctured the resulting pressure drop in the external jacket is detected and supply of the conveyed liquid can be promptly stopped.
For such tubes there is the difficulty of providing unions rapidly as it is necessary to ensure continuity both of the duct and the coaxial chamber without leakage between them.
In U.S. Pat. No. 5,398,976 there was proposed a reducer sleeve made of elastomer and having one end with a first diameter suited for receiving a double-wall tube and the other end with a second diameter suited for being traversed only by the internal core of the tube. In a zone intermediate between its ends the sleeve has a connection traversing the sleeve wall and designed for connecting the end of a separate flexible tube with the interior of the sleeve. In use a double-wall tube should be prepared by removing the external wall of the tube from a point onward. The sleeve is fitted on the tube at the terminal end of the external tube wall so that the double-wall tube will enter the sleeve from the end with larger diameter but only the internal core of the tube emerges from the reduced diameter end. The ends of the sleeve are clamped on the tube so that the terminal edge of the tube external wall is sealed inside the sleeve in a zone where the sleeve has the tube connection. In this manner the sleeve seals the air space in the double-wall tube and connects it to the tube grafted to the connection on the outside of the sleeve. According to the contents of U.S. Pat. No. 5,398,976 this sleeve can serve to terminate the external wall of the tube so as to reduce the double-wall tube to a single-wall tube consisting of the internal wall of the double-wall tube. Two double-wall tube sections can be connected by using two sleeves of the above mentioned type to reduce to a single-wall tube the tube ends to be connected and then jointing the single-wall tubes thus obtained with a normal known tube union. The air spaces terminated in the sleeves are connected together by means of a short length of tube with both ends grafted to the sleeve connections.
Such a procedure is clearly laborious and requires rather high manual skill while exposing to risk of leaks due to breakage of the tube core in the uncovered zone between the two sleeves.
The general purpose of the present invention is to overcome the drawbacks of the prior art by supplying unions easy, safe and fast to use for double-wall tubes. Another purpose is to supply dies therefor.
In view of this purpose it is sought to provide in accordance with the present invention a tube union having a first external wall and a second internal wall coaxial with the first to define a chamber around a central duct with the union comprising at least two seats for reception each of one end of a tube to be connected and each seat comprising a first surface designed to adhere to an end segment of the first wall of a tube inserted in the seat and a second surface coaxial with the first and designed to adhere to an end segment of the second wall of said tube with there being between the first and second surfaces of each seat of the union a connection surface with the union comprising at least one first duct leading onto said connection surfaces to provide connection between the chambers of tubes inserted in the seats and at least one second duct leading into spaces circumscribed by the second surfaces to provide connection between the central ducts of said tubes.
Again in accordance with the principles of the present invention it is sought to provide a die for production of unions for double-wall tubes with air space comprising plugs for making seats to receive the ends of the tubes to be jointed and broaches for making ducts for connection of the air space of the tubes when the die is in pressing position with the broaches intersecting the plugs and entering them through the mouthpieces of said seats.
To clarify the explanation of the innovative principles of the present invention and its advantages compared with the prior art there are described below with the aid of the annexed drawings possible embodiments thereof by way of non-limiting examples applying said principles. In the drawings:
With reference to the FIGS
The unions in accordance with the present invention are designed to be employed for permanent connection of double-wall tubes 50 i.e. the type having a first external wall 11 and a second internal wall 12 coaxial with the first to define a chamber 13 around a central duct 14. If necessary the tube can even be the multilayer type with the innermost layer 15 suited for contact with the fluid conveyed and external layers suited for jointing with the union. The joint can be made by various methods designed for permanent connection such as electric furnace melting by means of heating resistances 16 embedded in the sleeve material, polyfusion or gluing with suitable glue. The sleeve will be produced with suitable material or compositions of members of suitable materials as may be readily imagined by those skilled in the art so that the selected joint system can also be used by virtue of the material or materials composing the tubes to be jointed so that the appropriate surfaces of the union can adhere permanently to the corresponding tube walls.
The union of
Each seat comprises a first surface 19 designed to adhere to an end segment of the first wall 11 of a tube inserted in the seat and a second surface 20 coaxial with the first and designed to adhere to an end segment of the second wall 12 of the tube.
Between the first and second surfaces of the union there is a connection surface 21 which can advantageously constitute the head beat for at least the external wall 11 of the tube inserted in the seat.
In the embodiment shown in
The union comprises in its body first ducts 22 opening onto said connection surfaces 21 and second ducts 23 opening into spaces circumscribed by the second surfaces 20. As clarified in the figure, in this manner the first ducts 22 provide the connection between the chambers 13 of the tubes inserted in the seats while the second ducts 23 provide the connection between the central ducts of said tubes.
As may be seen in
As may be seen in
As shown in
The union 510 has seats 517 having connection surfaces 519, 520 for the external wall and internal wall of double-wall tubes to be jointed. The three seats 517 are connected by means of the passage to T 523. Between wall 519 and wall 520 of each seat there is a connecting surface 521 inclined to define an annular chamber as shown in the embodiments of
As clarified by
It is now clear that the predetermined purposes have been achieved by making available union members for permanent connection of double-wall tubes. It is noted that with a union in accordance with the present invention it is possible to connect several double-wall tubes in a single operation for example by fusion in an electric furnace.
Naturally the above description of embodiments applying the innovative principles of the present invention is given by way of non-limiting example of said principles within the scope of the exclusive right claimed here.
For example the union can be made up of an innermost part of material suited for connection with the tube material and an outer part of different material selected for example for its mechanical characteristics.
In addition the characteristics of the various unions shown can be taken from one union to the other.
Genoni, Marco, Genoni, Massimo, Zappa, Guido
Patent | Priority | Assignee | Title |
10066774, | Mar 27 2015 | RTX CORPORATION | Double wall tube fitting with an integrated diagnostic port |
10393302, | Jun 18 2014 | RTX CORPORATION | Double wall tube bolted flange fitting |
10544889, | Feb 17 2012 | CORE LINEPIPE INC. | Pipe, pipe connection and pipeline system |
11156312, | Aug 14 2020 | Trinity Bay Equipment Holdings, LLC | Tensile capacity electrofusion pipeline systems and methods |
11454346, | Oct 16 2015 | Pioneer Lining Technology Limited | Monitoring of lined pipeline |
6565127, | Mar 08 2001 | ENVIRON-OPW, INC | Pipe coupling device and assembly |
6769719, | Oct 26 2001 | Nupi S.p.A. | Multilayer tube with butt weldable end and welding method for a multilayer tube |
6848720, | Aug 09 2002 | The Boeing Company; Boeing Company, the | Shrouded fluid-conducting apparatus |
7144045, | Mar 12 2001 | Karl-Heinz Krah GmbH | Electrofusion socket forming system |
7213787, | Jun 07 2005 | The Boeing Company | Valves for annular conduits including aircraft fuel conduits and associated systems and methods |
7219857, | Jun 20 2005 | The Boeing Company | Controllable refueling drogues and associated systems and methods |
7293741, | Jun 09 2005 | The Boeing Company | System and methods for distributing loads from fluid conduits, including aircraft fuel conduits |
7309047, | Feb 25 2005 | The Boeing Company | Systems and methods for controlling flexible communication links used for aircraft refueling |
7437952, | Jun 10 2005 | The Boeing Company; BOEING COMPNAY, THE | Shrouded body flow meter assembly |
7458543, | Jun 10 2005 | Boeing Company, the | Aerial refueling system |
7469863, | Mar 24 2005 | The Boeing Company | Systems and methods for automatically and semiautomatically controlling aircraft refueling |
7472868, | Sep 01 2005 | The Boeing Company | Systems and methods for controlling an aerial refueling device |
7493911, | Aug 09 2002 | The Boeing Company | Shrouded valve apparatus and related methods |
7533850, | Jun 09 2005 | The Boeing Company | Fittings with redundant seals for aircraft fuel lines, fuel tanks, and other systems |
7581700, | Jun 09 2005 | The Boeing Company | Adjustable fittings for attaching support members to fluid conduits, including aircraft fuel conduits, and associated systems and methods |
7614661, | Sep 14 1999 | Petro Technik Limited; Georg Fischer Wavin AG | Welding socket |
7637458, | Jun 08 2005 | The Boeing Company | Systems and methods for providing back-up hydraulic power for aircraft, including tanker aircraft |
7665479, | Jun 10 2005 | The Boeing Company | Aerial refueling system |
7767938, | Mar 12 2001 | Karl-Heinz Krah GmbH | Electrofusion socket forming system |
7887010, | Jun 20 2005 | The Boeing Company | Controllable refueling drogues and associated systems and methods |
7922122, | Jun 09 2005 | The Boeing Company | Systems and methods for distributing loads from fluid conduits, including aircraft fuel conduits |
7946038, | Jun 09 2005 | The Boeing Company | Adjustable fittings for attaching support members to fluid conduits, including aircraft fuel conduits, and associated systems and methods |
8356842, | Jun 09 2005 | Fittings with redundant seals for aircraft fuel lines, fuel tanks, and other systems | |
9719622, | Jul 08 2013 | Georg Fischer Harvel LLC | Electrofusion fittings and methods |
9857003, | Feb 17 2012 | CORE LINEPIPE INC | Pipe, pipe connection and pipeline system |
9939098, | Aug 20 2012 | Technip France | Intermediate coupling for connecting rigid pipe elements for conveying a fluid, and associated pipe network and assembly method |
Patent | Priority | Assignee | Title |
3068563, | |||
3499188, | |||
4779652, | Apr 09 1987 | ASAHI AMERICA, INC ; CITIZENS TRUST COMPANY | Unitary double wall piping system |
4886305, | Aug 12 1988 | Fibercast Company | Double containment pipe fittings and apparatus to adhesively install the same |
4932257, | Oct 01 1987 | TOTAL CONTAINMENT, INC | Double wall piping system |
5189790, | Jun 22 1990 | Benteler Aktiengesellschaft | Method of fabricating a double walled pipe elbow |
5277455, | Sep 25 1992 | J H FENNER & CO LIMITED | Plastic lined dual containment piping system |
5364130, | Feb 22 1993 | Streng Plastic AG | Coupling for tubular plastic pipes with liner of socket and liner of pipes being heat weldable |
5398976, | Aug 03 1992 | ENVIRON-OPW, INC | Connecting device for pipe assemblies |
5400828, | Jul 08 1993 | ZIU, CHRISTOPHER G ; MONROE RECEIVING CORP | Double-containment piping supports for improved annulus flow |
5433484, | Nov 15 1993 | IPEX USA LLC | Double containment pipe and fitting joint |
5449204, | Oct 22 1993 | Double containment fitting | |
6127662, | Sep 20 1995 | Plasson Maagan Michael Industries Ltd | Electrofusion method and device |
6198081, | Jun 13 1994 | Georg Fischer Rohrleitungssysteme AG | Welding sleeve of thermoplastic material with indicator |
GB2318543, |
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